Inking mechanism of printing presses



Dec# 15, 1925- o, FINKHAUS INKIG MECHANISMQPPRINTING PRESSES Filed Aug. 2, 1924 'nventolf @@FMXW,

Patented Dec. l5, 1925,

UNITED 's'rATEsj PATENT OFFICE.

OSKAR FINKHAUS, 0F WRZBURG, GERMANY, ASSIGNOIIR,` T0 BOHN 8c HERBER,

MASCHINENFABRIK UND EISENGIESSEREI, 0F WRZBURG, BAVARIA, GERMANY, A. KOMMANDITGESELLSCHAFT OF GERMAN LAW.

INKING MEGHANI-SM 0F PRINTING-PRESSES.

Application led August'2,1924. Serial No. 729,812.

T0 all whom t may veminem.:

Be it known that I, OSKAR FINKHAUS, a citizen of Deutsches Reich, and residing at 34 letrinistreet, Wurzburg, Bavaria, Germany, have invented certain new and useful'lmprovements in the Inking Mechanism of Printing Presses; and I do he/reby Ydeclare that the following is -a full, clear,

and exact description of the same.

The Well known cylinder inking devices,

of high speed printing presses with apreliminary distributing mechanism separated from the inking-in mechanism by an' insertedv doctor roller have,it is true, in' themselves considerable advantages as compared with the arrangement without a doctor roller at that point; these well known constructions have however the drawback that the doctor roller, owing to its small circumference, transfers the ink uniformly smoothed out by the preliminary distributino' r0llers,in a thick layer to the inking ro ler mechanism, and that therefore the said thick layer has to be distributed 'down again by the inking roller mechanism. The inking roller mechanism requires at each printing operation as much ink asv is consumed for one printing andl the quantity is in a definite proportion to the lengthof the type form. .If the circumference of the doctor roller is considerably smaller than the length of the form, the ink must be distributed on it in a correspondingly thicker layer. In Well known constructions, the circumference of the doctor roller in only l to 1/5 of the length of the form. The above mentioned drawback is the reason why inkin mechanisms with a reciprocatin distributing table are preferred to cy inder inking devices.

ThisI invention has for its object to eliminate the said drawback, and consists in arranging, between the preliminary distributing evice and the inking roller mechanism, anink transfer cylinder of a circumference equal vt9 the greatest length of the type form, the said cylinder being alternately 'mary distributing mechanism and with the inking roller mechanism. On an ink transfer cylinder of such circumference the ink is then distributed in a much thinner layer than on a doctor roller of the usual diameter. The ink is therefore distributed more uniformly and to greater advantage.

If this layer on the transfer cylinder, taken from the preliminary distributing mechanism, is assumed to be a band of a length equal to that of the type form, the` brought in contact with the prelimthe ink transfer cylinder, passes, Without its thickness and length-being altered, being merel distributed among the various inking ro 1ers, through the inking roller mechanism, without being substantially modified thereby. Whenl therefore a layer of ink of the kind just described is deposited by the preliminary distributing mechanism on the ink'transfer cylinder, which can be easily ensured by means of the preliminary distributing mechanism, there is no doubt but that the layer of ink will reach the form in correct distribution.

When for instance a tone surface, that is to say a ysurface with a perfectly uniform ink covering is to be rinted, the above mentioned thin layer o ink will be able to pass without any modification to the form. Any greater nene that can be obtained by the preliminary distributing mechanism 1S therefore unnecessary in any conditions. The circumference to be lgiven according to this invention, to the ink transfer cylinder, is therefore the greatest that is required for the purpose of ensuring uni- Iform distribution of the ink.

In the drawings in which similar reference characters indicate the same parts in the several figures,

Figure 1 is a diagrammatic and fragmentar longitudinal section of a higlh speed at form cylinder press showing t e invention, and

Fi re 2 is a similar view of a modiied orm of the invention. y

The inking mechanism of the first construction Figure 2, is constituted by the ink trough f with a doctor roller 7L, the preliminary distributing mechanism with the distributing cylinders 1', fr and the distributing rollers w, w. These parts constitute the preliminary -distributing mechanism. It is followed by the ink transfer cylinder z which is made as a bare iron cylinder without any 'composition covering; adjoining the said cylinder is the inking roller mechanism with the distributing rollers c, c andl c, distributing cylinders b, b and b and inking rollers a, a and a. y Y- The ink transfer cylinder is mounted in an eccentric e and by turning the said eccentric by means of va rod can be brought alternately against the distributin roller lw and the distributing roller c, that 1s to say alteri nately against the preliminary distributing mechanism and the inking roller mechanism. The form of the press is indicated at-s, and d is the impression cylinder.

The second example (Figure l) differs from the lirst one only by the inktransfer cylinder e being fixed in the frame of the machine, whilst the two distributing rollers fw,' and c are mounted on oscillating bell crank levers m or fn.' which can turn about the axes of the distributing cylinders r or b. The bell crank levers m and n are connected together by a rod lc and can be turned by means of a rod Z. During-the turning of the bell crank levers m and n, the distributing rollers w and 0 are brought alternately in and out of contact with the ink transfer cylinder .a so that the latter is alternately in contact with the preliminary distributing mechanism and with the inking roller mechanism.

The operation of the two inking devices illustrated is as follows First the ink transfer cylinder is brou ht in contact with the preliminary distributing mechanism. The uniform speed of rotation 'of the preliminary distributing mechanism is so set that the ink transfer cylinder a, as long as it remains in connection with the preliminary distributing mecha nism, rotates at the same speed as that of the printing carriage or bed during contact with the inking roller mechanism. The ink transfer 'cyhnder remains 1n contact with the preliminary distributing cylinder approximately until it has com leted two revolutions.

VThen it is brought y an opposite movement of the rod g or Z into contactwith the inking roller mechanism, so' that a fresh layer of ink passes from it to the inking roller mechanism. The ink transfer cylinder continues to rotate in the same direction and with the same speed as before.

'As soon as it has completed one revolution,

it is again brought out of contact with the inking roller mechanism, so that it is in contact neither with the latter nor with the preliminary distributing mechanism., 'After the preliminary rubbing mechanism has been given time to thoroughly distribute the fresh ink, the movement of the rod g or l is completed, so that the ink transfer cylinder is then againin contact with the preliminary distributing mechanism.

It is not absolutely essential that 'both oscillating rollers o and fw in the construction in Figure 1, should be moved simultaneously and by the same rods; on the contrary, the arrangement could be such that both rollers would be in contact with the ink transfer cylinder a at different times.

The'construction shown in Figure 1l has the advantage that a movement of the heavy ink transferl cylinder and its support vbecome unnecessary, land invplace of it, only the relatively light rollers to and 0 are moved. The construction ofthe in k transfer cylinder o f bare iron, Without composition covering,'has the advantage that this heavy and large cylinder need not be removed from 'time to time from the machine for the purpose of renewing the composition covering, and that consequently it can be supported in a very simple manner.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed l declare that what I claim isz- 1. A cylinder inking mechanism for printing presses comprising an ink trough at one fend ofsaid press and. :1n-impression cylinder at the other end of the press, a rotary 'fink transfer cylinder interposed between said ink trough and impression cylinder and rotating in one direction, a preliminary ink distributing mechanism interposed between said ink trough and ink transfer cylinder, a form inkin mechanism interposed between the impression cylinder and the ink transfer cylinder, a type form adapted to be brought in contact with said form inking mechanism and impression cylinder, said ink transfer cylinder having a circumference substantially equal to the greatest length of said type form, and means for alternately bringing the cylinderical surface of said ink transfer cylinder in contact with the preliminary ink f 1,566,1s I a distributing. mechanism and the formyinkink transfer cylinder and the preliminary ing mechanism. y .l ink distributing mechanism on one side, and 2. A cylinder inking mechanism for prin-V a doctor roller arranged between -the ink ing presses according to claim 1, in' which transfer cylinder and the form inking mechi ithe ink transfersurface of said ink transfer anism on the other side of `said ink transfer ll cylinder is made of iron or like material.' cylinder. l

3. A cylinder'inking mechanism for print- Signed at Wurzburg this 19th day of May, ing lpresses according tofclaim 1,.in which 1924. A l the ink transfer cylinder rotates lupon a iixedv 10 axis', a doctorroller arranged between the OSKR FINKHAUS. 

